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A doctor branded the 'Swedish Fritzl' has been sentenced to ten years in prison for abducting a woman and locking her in a homemade bunker, but was acquitted of aggravated rape.

In a unanimous verdict, Stockholm District Court said Martin Trenneborg meticulously planned the abduction over a long period of time and subjected the victim to serious risk by sedating her and keeping her caged up in a soundproof bunker for almost a week.

The 38-year-old doctor, who claimed he was suffering a mental disorder at the time, was ordered to pay 180,000 kronor (NZ$31,581) in damages to the woman.

The original is currently serving life imprisonment in a maximum security Austrian psychiatric facility following his 2009 conviction for rape and murder following the incarceration of his own daughter, Elisabeth, in a cellar beneath his home for 24 years.

Trennenborg, who studied medicine at the prestigious Karolinska Institute in Stockholm, before working as a GP in Stockholm and Kristianstad, spent far less time tormenting his victim, but prosecutors say his crime was just as heinous.

Dr Trenneborg, who claims to be a member of the high-IQ club Mensa, admitted feeding his victim the strawberries laced with Rohypnol on September 12 last year, before driving her to his home in Skåne in southern Sweden and entombing her in the secret bunker.

Six days later, he walked into a police station in Stockholm along with the woman.

Police found a plastic full of drugs, syringes and condoms in the doctor's home. Photo / Supplied

Police found a plastic full of drugs, syringes and condoms in the doctor's home. Photo / Supplied